Play Programming Language

Play is small programming language intended for used as a test bed for various compiler, runtime, and debugger technologies. It uses nearley.js and moo.js for building the parser.

To learn more about how Play is built:

• See Play's predecessor: fun-lang.
• Watch this video series to learn how to make a programming language.

Videos about the Time Traveling Debugger

The current major experimental feature I am going for is the time traveling debugger, to learn more about it, you can watch these videos:

• Time Traveling Debugger - Part 1
• Time Traveling Debugger - Part 2
• Time Traveling Debugger - Part 3
• Dream of the Time Machine
• Implementing Closures in Play Lang Playlist

Todo

• do some code challenges on CodeWars, etc
• gather closure info function, doesn't work with the loop iterator variable of a for loop
• make some toy programs
• anonymous functions as closure providers
• use static analysis to check for references of undefined functions
• debugger: don't show vdom?
• clean up closures when functions are no longer referenced
• clean up unused heap variables?
• heap display goes into disarray when there is too much data
• bug: why is styles object nested in dom.play example?
• numbers nested inside objects are always being interpreted as heap IDs, we may need ref objects to * distinguish refs
• there seems to be a bug with VDOM when changes styles across multiple calls to setStyle()
• Canvas API
• when scrubbing the timeline, have the code display pan to the selected line
• syntax highlighter for Atom and/or VS Code

Done

• suspend execution while in debugger mode
• display closure variables in stack frame within debugger
• UI for time-traveling (1st draft done)
• DOM events
• make closures work...